(19)

(11)

EP 0 777 723 A1

(12)

(43) Date of publication: 11.06.1997 Bulletin 1997/24 (21) Application number: 95926945.0 (22) Date of filing: 14.07.1995

(51) International Patent Classification (IPC):  B01D 19/ 04( . ) C11D 3/ 37( . ) C11D 3/ 00( . ) C11D 17/ 00( . ) (86) International application number: PCT/EP1995/002832 (87) International publication number: WO 1996/006921 (07.03.1996 Gazette 1996/11)

(84) Designated Contracting States: DE ES FR GB IT (30) Priority: 26.08.1994 GB 19940017371 (71) Applicants: UNILEVER PLC London EC4P 4BQ (GB) UNILEVER N.V. 3013 AL Rotterdam (NL)	(72) Inventors: VAN DER HOEVEN, Frans, Albertus NL-3069 DN Rotterdam (NL) HOUGHTON, Mark, Philip NL-2651 VG Berkel en Rodenrijs (NL) (74) Representative: Fransella, Mary Evelyn, et al  Unilever PLC Patent Division Colworth House Sharnbrook Bedford MK44 1LQ Bedford MK44 1LQ (GB)